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49 lines
1.9 KiB
Kotlin
49 lines
1.9 KiB
Kotlin
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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package org.mozilla.fenix.tabstray.browser
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import androidx.recyclerview.widget.RecyclerView
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import kotlinx.coroutines.ExperimentalCoroutinesApi
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import kotlinx.coroutines.flow.Flow
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import kotlinx.coroutines.flow.collect
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import kotlinx.coroutines.flow.map
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import mozilla.components.browser.tabstray.TabsAdapter.Companion.PAYLOAD_DONT_HIGHLIGHT_SELECTED_ITEM
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import mozilla.components.browser.tabstray.TabsAdapter.Companion.PAYLOAD_HIGHLIGHT_SELECTED_ITEM
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import mozilla.components.lib.state.helpers.AbstractBinding
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import mozilla.components.support.ktx.kotlinx.coroutines.flow.ifChanged
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import org.mozilla.fenix.tabstray.TabsTrayState
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import org.mozilla.fenix.tabstray.TabsTrayState.Mode
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import org.mozilla.fenix.tabstray.TabsTrayStore
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/**
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* Notifies the adapter when the selection mode changes.
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*/
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@OptIn(ExperimentalCoroutinesApi::class)
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class SelectedItemAdapterBinding(
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store: TabsTrayStore,
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val adapter: RecyclerView.Adapter<out RecyclerView.ViewHolder>
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) : AbstractBinding<TabsTrayState>(store) {
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override suspend fun onState(flow: Flow<TabsTrayState>) {
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flow.map { it.mode }
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.ifChanged()
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.collect { mode ->
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notifyAdapter(mode)
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}
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}
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/**
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* N.B: This method should be made more performant to find the position of the multi-selected tab that has
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* changed in the adapter, and then [RecyclerView.Adapter.notifyItemChanged].
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*/
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private fun notifyAdapter(mode: Mode) = with(adapter) {
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if (mode == Mode.Normal) {
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notifyItemRangeChanged(0, itemCount, PAYLOAD_HIGHLIGHT_SELECTED_ITEM)
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} else {
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notifyItemRangeChanged(0, itemCount, PAYLOAD_DONT_HIGHLIGHT_SELECTED_ITEM)
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}
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}
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}
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